US5237320A
Expired / Lapsed
US
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Radio paging system with different transmission speeds and receiver therefor
Assignee: NEC Corp
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Filing: 1991-04-04
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Granted: 1993-08-17
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Expires: 2011-04-04
Abstract
Abstract A paging system includes a receiver adapted for receiving paging signals at a fixed bit rate of N·R where N is an integer and R is a basic bit rate. A transmitter transmits at the N·R bit rate, N being adjustable to accommodate any signal for any particular receiver. The transmitter bit rate is selected according to serial data received from a telephone exchange with a message to be transmitted. The transmitter has a degree indicating system producing a first signal representative of a degree N when it receives a signal which is representative of a bit rate N·R. It has interleaving means for N-degree interleaving of input data having the bit rate N·R, in response to the first signal, to produce an interleaved signal; and transmitting means for transmitting said interleaved signal. The receiver has means for receiving a signal whose bit rate is N·R bit rate indicating means for outputting a first signal which is representative of N; de-interleaving means for N-degree de-interleaving the received signal, in response to the first signal, to produce a de-interleaved signal; and deciding means for deciding whether or not a paging address number, which may be included in the de-interleaved signal, is assigned to the receiver. Alarm means may produce an audible alarm in response to an output of the deciding means.
Inventors
- 👤 Toshifumi Sato
- 👤 Takashi Oyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:07
CPC Classifications
H; H04; H04W; H04W8/00; H04W8/22; H04W8/24; H04W8/245; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
84 words
A transmitter for a paging system, comprising: means for producing a first signal representative of an amount N of interleaving in response to a signal which is representative of a bit rate N·R, where N is a positive integer and R is a basic bit rate; interleaving means for interleaving input data having the bit rate N·R in response to said first signal to produce an interleaved signal, the amount of interleaving being equal to N; and transmitting means for transmitting said interleaved signal.
Claim 2
Dependent Claim
84 words
A transmitter for a paging system, comprising: means for producing a first signal representative of an amount N of interleaving in response to a signal which is representative of a bit rate N·R, where N is a positive integer and R is a basic bit rate; interleaving means for interleaving input data having the bit rate N·R in response to said first signal to produce an interleaved signal, the amount of interleaving being equal to N; and transmitting means for transmitting said interleaved signal.
Claim 3
Dependent Claim
26 words
A transmitter in accordance with claim 1, wherein said transmitting means comprises means for frequency shift keying (FSK) modulating a carrier wave with said interleaved signal.
Claim 4
Dependent Claim
160 words
A transmitter in accordance with claim 1, wherein said interleaving means comprises: a first memory bank and a second memory bank; selecting means for selecting said first and second memory banks to a write-in and a read-out mode alternately, for each interleave block of said input data; first address outputting means for outputting a first address in direct response to said first signal; delaying means for delaying said first signal by one interleave block of said input data; second address outputting means for outputting a second address, which is produced by N-degree interleaving said first address, in response to an output of said delaying means; memory means comprising said first and second memory banks, in which said input data is written in any one of said first and second memory banks which corresponds to said first address; and said interleaved signal is read out of any one of said first and second memory banks which corresponds to said second address.
Claim 5
Dependent Claim
16 words
A transmitter in accordance with claim 3, wherein said memory means comprises a random access memory.
Claim 6
Dependent Claim
51 words
A transmitter in accordance with claim 3 wherein said interleave block has a length of N×L where L is a length which constitutes one frame of said input data at said basic bit rate, each of said first and second address outputting means comprising an N-bit counter and an L-bit counter.
Claim 7
Dependent Claim
17 words
A transmitter in accordance with claim 3, wherein said selecting means comprises a T-type flip-flop and inverter.
Claim 8
Dependent Claim
107 words
A receiver for a paging system, comprising: receiving means for receiving a signal containing input data whose bit rate is N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate; bit rate indicating means for outputting a first signal which is representative of N; de-interleaving means for de-interleaving the received signal in response to said first signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding means for deciding whether or not a paging address number included in said de-interleaved signal is an address number which is assigned to said receiver.
Claim 9
Dependent Claim
107 words
A receiver for a paging system, comprising: receiving means for receiving a signal containing input data whose bit rate is N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate; bit rate indicating means for outputting a first signal which is representative of N; de-interleaving means for de-interleaving the received signal in response to said first signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding means for deciding whether or not a paging address number included in said de-interleaved signal is an address number which is assigned to said receiver.
Claim 10
Dependent Claim
25 words
A receiver in accordance with claim 7, further comprising alarm means for producing an audible alarm in response to an output of said deciding means.
Claim 11
Dependent Claim
161 words
A receiver in accordance with claim 7, wherein said de-interleaving means comprises: a first memory bank and a second memory bank; selecting means for selecting said first and second memory banks to a write-in and a read-out mode alternately, for each interleave block of the input data; first address outputting means for outputting a first address in direct response to said first signal; delaying means for delaying said first signal by one interleave block of said input data; second address outputting means for outputting a second address, which is produced by N-degree de-interleaving said first address, in response to an output of said delaying means; and memory means comprising said first and second memory banks, in which said received data is written in any one of said first and second memory banks which corresponds to said first address; and said de-interleaved signal is read out of any one of said first and second memory banks which corresponds to said second address.
Claim 12
Dependent Claim
16 words
A receiver in accordance with claim 9, wherein said memory means comprises a random access memory.
Claim 13
Dependent Claim
51 words
A receiver in accordance with claim 9, wherein said interleave block has a length of N×L where L is a length which constitutes one frame of said input data at said basic bit rate, each of said first and second address outputting means comprising an N-bit counter and an L-bit counter.
Claim 14
Dependent Claim
17 words
A receiver in accordance with claim 9, wherein said selecting means comprises a T-type flip-flop and inverter.
Claim 15
Dependent Claim
66 words
A paging system comprising: means for interleaving a paging signal having a bit rate of N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate and transmitting the N-degree interleaved paging signal, the amount of de-interleaving being equal to N; and deciding means for deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 16
Dependent Claim
66 words
A paging system comprising: means for interleaving a paging signal having a bit rate of N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate and transmitting the N-degree interleaved paging signal, the amount of de-interleaving being equal to N; and deciding means for deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 17
Dependent Claim
35 words
A system in accordance with claim 13, further comprising means for producing an audible alarm in response to an output of said deciding means which shows that said de-interleaved signal includes said desired paging signal.
Claim 18
Dependent Claim
92 words
A paging receiver for receiving and demodulating a digital modulated signal and, when detected, a paging signal of said receiver within a demodulated signal producing an annunciating signal, comprising: means for indicating a bit rate N·R of a signal transmission, where N is a positive integer representative of the amount of interleaving of said demodulated signal and R, a basic bit rate; and means for de-interleaving said demodulated signal in response to said bit rate which is indicated by said bit rate indicating means, the amount of de-interleaving being equal to N.
Claim 19
Dependent Claim
92 words
A paging receiver for receiving and demodulating a digital modulated signal and, when detected, a paging signal of said receiver within a demodulated signal producing an annunciating signal, comprising: means for indicating a bit rate N·R of a signal transmission, where N is a positive integer representative of the amount of interleaving of said demodulated signal and R, a basic bit rate; and means for de-interleaving said demodulated signal in response to said bit rate which is indicated by said bit rate indicating means, the amount of de-interleaving being equal to N.
Claim 20
Independent Claim
89 words
A method of transmitting and receiving a paging signal, comprising the steps of: interleaving a paging signal whose bit rate is N·R where N is a positive integer representative of the amount of interleaving of said demodulated signal and R is a basic bit rate, the amount of de-interleaving being equal to N; transmitting the interleaved paging signal; de-interleaving the transmitted paging signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 21
Independent Claim
89 words
A method of transmitting and receiving a paging signal, comprising the steps of: interleaving a paging signal whose bit rate is N·R where N is a positive integer representative of the amount of interleaving of said demodulated signal and R is a basic bit rate, the amount of de-interleaving being equal to N; transmitting the interleaved paging signal; de-interleaving the transmitted paging signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 22
Dependent Claim
29 words
A method in accordance with claim 16, further comprising the step of generating an audible alarm when it is decided that said de-interleaved signal includes said desired paging signal.
Claim 23
Independent Claim
68 words
A method of receiving a paging signal, comprising the steps of: receiving a signal whose bit rate is N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate; de-interleaving the received signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 24
Independent Claim
68 words
A method of receiving a paging signal, comprising the steps of: receiving a signal whose bit rate is N·R where N is a positive integer representative of the amount of interleaving and R is a basic bit rate; de-interleaving the received signal to produce a de-interleaved signal, the amount of de-interleaving being equal to N; and deciding whether or not said de-interleaved signal includes a desired paging signal.
Claim 25
Dependent Claim
25 words
A method in accordance with claim 18, further comprising the step of producing an audible alarm when said de-interleaved signal includes said desired paging signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |